Spraying method for improving corrosion resistance of plastic-coated steel tube
A plastic-coated steel pipe, performance technology, applied in chemical instruments and methods, devices for coating liquid on the surface, coating, etc., can solve the problem of poor adhesion of epoxy coating, inapplicability to the use environment, and low firmness, etc. Problems, to achieve the effect of ensuring no falling off, improving bonding force, and improving adhesion
Inactive Publication Date: 2021-11-02
重庆鼎久管道有限公司
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Problems solved by technology
However, the anti-corrosion steel pipe with this structure has defects during use. The adhesion of the epoxy coating is not good, the firmness is not high, and there is still the problem of coating peeling off, so it cannot be used in harsh environments.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0030] A spraying method for improving the anticorrosion performance of plastic-coated steel pipes, comprising the following steps:
[0031] S1: Pretreatment, sandblasting the substrate to ensure its surface is smooth, and its surface cleanliness reaches Sa2.5 level, then scratches are set on the surface of the polished substrate, and then heated to 100-125°C;
[0032] S2: Primer spraying, keeping the temperature constant, spraying solvent-free epoxy anti-corrosion primer on ...
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Abstract
The invention relates to the technical field of plastic-coated steel tube production, in particular to a spraying method for improving the corrosion resistance of a plastic-coated steel tube. The spraying method comprises the following steps of S1, pretreatment; S2, primer spraying; S3, reinforcing layer spraying; S4, finish paint spraying; and S5, cooling and quality inspection of the steel tube after spraying is completed so as to obtain the finished plastic-coated steel tube. According to the spraying method, the adhesive force of an anti-corrosion coating sprayed on the surface of a base material can be effectively improved, the bonding degree between a primer and the base material and the bonding degree between the primer and the finish paint can be improved, so that the adhesive force of the coating is improved, pores are prevented from appearing in the coating, and the corrosion resistance of the plastic-coated steel tube is enhanced.
Description
technical field [0001] The invention relates to the technical field of production of plastic-coated steel pipes, in particular to a spraying method for improving the anti-corrosion performance of plastic-coated steel pipes. Background technique [0002] In order to enable the steel pipe to effectively block corrosive substances, the outer surface of the steel pipe is usually subjected to anti-corrosion treatment to improve its corrosion resistance, thereby prolonging the service life of the steel pipe and making it better used in marine engineering, oil transportation engineering and other fields. [0003] The current anti-corrosion steel pipe includes the steel pipe body and the epoxy powder coating arranged on the outer surface of the steel pipe body. A layer of epoxy powder, so that the epoxy powder adheres to the outer surface of the high temperature steel pipe body to form a fusion bonded epoxy coating. However, the anti-corrosion steel pipe with this structure has def...
Claims
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IPC IPC(8): B05D7/14B05D7/02B05D3/12B05D7/00B32B1/08B32B15/18B32B15/14B32B15/085B32B27/02B32B27/32B32B33/00B32B37/00B32B38/00B32B38/16
CPCB05D7/146B05D7/02B05D3/12B05D7/5483B32B1/08B32B15/18B32B15/14B32B5/028B32B33/00B32B37/00B32B38/0012B32B38/0036B32B38/162B32B38/164B05D2254/02B05D2401/40B05D2504/00B05D2502/00B32B2038/002B32B2038/0016B32B2262/0253B32B2255/06B32B2255/26B32B2255/02B32B2307/714B32B2037/243
Inventor 廖长生
Owner 重庆鼎久管道有限公司